diff --git a/sequelize/sequelize.d.ts b/sequelize/sequelize.d.ts
index 9b5e935bff..3f1e2c86fc 100644
--- a/sequelize/sequelize.d.ts
+++ b/sequelize/sequelize.d.ts
@@ -3949,6 +3949,11 @@ declare module "sequelize" {
              * We don't have a definition for the QueryGenerator, because I doubt it is commonly in use separately.
              */
             QueryGenerator: any;
+            
+            /**
+             * Returns the current sequelize instance.
+             */
+            sequelize: Sequelize;
 
             /**
              * Queries the schema (table list).
@@ -5706,12 +5711,12 @@ declare module "sequelize" {
             /**
              * Commit the transaction
              */
-            commit() : Transaction;
+            commit() : Promise<void>;
 
             /**
              * Rollback (abort) the transaction
              */
-            rollback() : Transaction;
+            rollback() : Promise<void>;
 
         }